hanson113175
Member
my questions regarding flash (sb80dx-d100) photography.
these are my observations and id like to ask the group for added insights with problems that i have encountered.
exposure compensation:
if we are to shoot in aperture mode, adding exposure compensation would slow down the shutter speed (without flash). if you turn on the sb80dx it automatically sets to 1/60, then if you compensate by 2 stops, it is technically suppose to make your shutter speed to 1/15. why then don't i get enough ambient light in my shot as compared to shooting manual mode with 1/15? i noticed that i tend to get a blown out subject instead of good exposed subject with good ambient light.
exposure compensation in all modes?
if without flash, the exposure cmpensation doesn't affect the settings in manual mode. why then is the exposure affected when i use exposure compensation in manual mode with the sb80dx turned on?
does this mean that the exposure compensation is flash compensation when the sb80dx is turned on? that it doesn't work with the way that it is suppose to work: compensate shutter or aperture?
flash distance vs. flash compensation:
i have noticed that these two properties are quite inversely proportional. if we add flash power, the distance is suppose to increase. if we lessen, the distance is suppose to decrease. why is it the other way around? try it and you'll notice it.
adjusting iso:
i tried adjusting the iso for 3 shots, 200, 800, 1600. the 1600 looks very overxposed, subject quite blown. isn't it that the flash should know that i am using 1600 and know how much light burst the camera needs? if not then why is it called DTTL?
dttl and underexposure:
i find the dttl to be really faulty. the dttl is suppose to bring out the ambient light. why doesn't it do this? does adjusting the levels of d100 through NC3 help improve dttl? or upgrading the software version?
magenta cast:
i have noticed that doing 2 shots continuously gives me a magenta cast on the second shot. i tried to adjust the white balance to flash instead of auto thinking that there is a faulty communication when the flash is recharging but the result is still the same. does this have to do with the fact that sb80dx is quite slow in recharging and the magenta cast is attributed to a 'not fully charged sb80dx' before exposure? someone told me that sb28dx is better because the recycling time is fast.
disabling the preflash:
i noticed that the custom setting 23 doesn't work on the sb80dx. at dttl, the monitor preflash functions correctly. at manual mode, the preflash is suppose to be disabled and the flash is expected to output at full power. this only happens with the built in flash. with the sb80dx attached, manual flash mode still functions as dttl. why? is there a way to fix this?
it's quite a long list of questions. i hope someone will be able to enlighten me and other users of this setup too - d100 and sb80dx.
thanks.
David
these are my observations and id like to ask the group for added insights with problems that i have encountered.
exposure compensation:
if we are to shoot in aperture mode, adding exposure compensation would slow down the shutter speed (without flash). if you turn on the sb80dx it automatically sets to 1/60, then if you compensate by 2 stops, it is technically suppose to make your shutter speed to 1/15. why then don't i get enough ambient light in my shot as compared to shooting manual mode with 1/15? i noticed that i tend to get a blown out subject instead of good exposed subject with good ambient light.
exposure compensation in all modes?
if without flash, the exposure cmpensation doesn't affect the settings in manual mode. why then is the exposure affected when i use exposure compensation in manual mode with the sb80dx turned on?
does this mean that the exposure compensation is flash compensation when the sb80dx is turned on? that it doesn't work with the way that it is suppose to work: compensate shutter or aperture?
flash distance vs. flash compensation:
i have noticed that these two properties are quite inversely proportional. if we add flash power, the distance is suppose to increase. if we lessen, the distance is suppose to decrease. why is it the other way around? try it and you'll notice it.
adjusting iso:
i tried adjusting the iso for 3 shots, 200, 800, 1600. the 1600 looks very overxposed, subject quite blown. isn't it that the flash should know that i am using 1600 and know how much light burst the camera needs? if not then why is it called DTTL?
dttl and underexposure:
i find the dttl to be really faulty. the dttl is suppose to bring out the ambient light. why doesn't it do this? does adjusting the levels of d100 through NC3 help improve dttl? or upgrading the software version?
magenta cast:
i have noticed that doing 2 shots continuously gives me a magenta cast on the second shot. i tried to adjust the white balance to flash instead of auto thinking that there is a faulty communication when the flash is recharging but the result is still the same. does this have to do with the fact that sb80dx is quite slow in recharging and the magenta cast is attributed to a 'not fully charged sb80dx' before exposure? someone told me that sb28dx is better because the recycling time is fast.
disabling the preflash:
i noticed that the custom setting 23 doesn't work on the sb80dx. at dttl, the monitor preflash functions correctly. at manual mode, the preflash is suppose to be disabled and the flash is expected to output at full power. this only happens with the built in flash. with the sb80dx attached, manual flash mode still functions as dttl. why? is there a way to fix this?
it's quite a long list of questions. i hope someone will be able to enlighten me and other users of this setup too - d100 and sb80dx.
thanks.
David
